Insulated pulley-block



" J. H. FLYNN, 1R.

INSULATED PULLEY BLOCK.

APPLICATION FILED MAR. 11. 1920.

1,359,04 Patented Nov. 16,1920.

2 SHEETS-SHEET I.

(26.3 l NVENTOR 1. H. FLYNN, JR.

INSULATED PULEEY BLOCK.

APPLICATION FlLED MAR. 11, 1920.

Patented Nov. 16, 1920.

2 SHEETS-SHEET 2.

JOHN H. FLYNN, JR, or CINCINNATI, OHIO.

INSULATED PULLEY-BLOCK.

Application filed March 11, 1929.

To all whom it may concern:

Be it known that I, JoHN H. FLYNN, Jr., a citizen of the United States,residing in Cincinnati, in the county of Hamilton and State of Ohio,have invented new and useful Improvements in Insulated Pulleylfilocks,cl which the following is a specification.

An object of my invention is to produce a pulley block especiallyadapted to be used by electric workers such as linemen in the stringingor repairing of trolley wires and the like, wherein the transmission ofcurrent through the blocks or ropes when wet, is overcome, thus avoidingthe possibility of electrocution.

This and other objects are attained in the block described in thefollowing specification and illustrated in the accompanying drawings inwhich Figure 1 is a perspective View of a block of the single sheavetype embodying my invention, part being broken away for purposes ofillustration.

Fig. 2 is an enlarged perspective view of a detail of the single sheaveblock shown in Fig. 1.

Fig. 3 is a perspective view of a detail of a double sheave blockembodying my invention.

Fig. 4 is a perspective view of a detail of a triple sheave blockembodying my invention.

F 5 is a perspective view of a detail of a quadruple sheave blockembodying my invention.

Fig. 6 is a perspective view of an overhead trolley wire system,illustrating the use of my improved insulated blocks in the repairing ofbroken wires which are highly charged.

The single sheave type of block shown in Figs. 1 and 2 has a block body7 which is molded of a strong material of insulating characteristics,there being a hook support ing looped member 8 molded in the upper endof the body and thimble supporting members 9 and 10 molded in the lowerpart of the body. A hook 11 is located in the loop at the upper end ofthe loop member and a bolt 12 in the lower ends of the thimblesupporting members supports a thimble 13. The body-embedded ends of theloop member 8 have transversely extending lugs 14, 15, 16 17, which arespaced from.

Specification of Letters Patent.

Patented Nov. 16, 1920. Serial No. 365,022.

correspondingly shaped transversely extending lugs l8, 19, 20 and 21 onthe thimble supporting members 9 and 10. Between the lugged ends of thelooped and thimble supporting members the journal pin 22 of a sheavewheel 23 is placed in embedded position within the body of the block,wheel 23 being located in a slot 2 1- molded in the body.

In the position of the journal pin it will be observed upon reference toFig. 1 that it is spaced from bot 1 the loop and thimble sup portingmembers and also that the member 8 does not touch members 9 and 10. Thusthere can be no possibility of the transmission of an electric currentthrough the block with the consequent liability of. electrocution orsevere shock such as is possible in the present block construction nowused.

In Fig. 3 the metal hook and thimble sup porting members 25, and 26,2'7, and 28 for a double sheave block are shown, and in Fig. 4 the hookand thimble supporting members 29 and 30, 31 and 32 of a triple sheaveblock are shown, the body-embedded ends of the members in eachconstruction being provided with lugs as in the previously describedsingle sheave construction. Fig. 5 shows a quadruple sheave block metalmember construction, the hook members 33, 34 and 35 of which arecomplemented by two thimble supporting members 36 and 37. In Fig. 6 Ihave shown an application of blocks and tackle to an overhead trolleywire which has broken and the ends of which are being drawn together tooin them. .n this operation the wire grippers 38 and 39 being made ofmetal and being connectet with the blocks 40 and 41, when such blocksare of the usual all metal type, permit the transmission of electriccurrent through either defective insulators 41 holding the live wires 41or through the rope 42 when, during a rain or sleet, the rope becomeswet. This has caused severe shocks and the loss of many lives throughthe lack of properly insulated pulley block construction of some kind.Now when such blocks are of a construction such as I have described asembodying my invention, there can be no possibility of such fatalitiesoccurring inasmuch as there is no direct metal connection from the wireto the rope and by making the block body of a suitably hard insulatingmaterial there can be no absorption. of current con g p es Which couldbe transmitembedded within the insulating material, ted by a Watersoaked rope or defective insua looped hook supporting member emlatorsholding live wires. bedded within the insulating material at Having thusdescribed my invention what the upper end of the body and spaced from 5I claim is r the pin and a thimble supporting member 20 1. An insulatedpulley block comprising a embedded within the insulating material atbody of insulating material, a sheave journal the lower end of the bodyand spaced from pin embedded within the insulating mathe pin, themembers being spaced from terial, a hook supporting member embedded eachother.

10 Within the insulating material and a thim- In witness whereof I aflixmy signature in 25 ble supporting member embedded within the thepresence of two witnesses. V insulating material, the members being JOHNFLYNN, J n. spaced from the journal pin. Witnesses:

2. An insulated block comprising a body W. T. SMITH,

15 of insulating material, a sheave journal pm W. J. SOHULTZ.

